The product is an original mounted negative of a PC Penn Central E-7b 4107 train in Harrisburg, Pennsylvania. As a collectible item in the category of railroadiana and trains, this negative captures a moment in transportation history and would be a valuable piece for enthusiasts or collectors of photographs and memorabilia related to the railroad industry. The unique aspect of this item is that it offers a glimpse into the past through a historical lens, providing a tangible connection to a specific era and location in the history of transportation.